Oh, btw, Worf on Next Generation would have a pet "Balzak" of his own as a boy. They're called Targs, and they'd be redesigned from that icky puppet to more like a cross between a unicorn and a boar. Weird stuff.

Never mind, I was wrong. Targs are more like boars with tusks and extra horns; "Ballsak" didn't really look like that. Memory Alpha says he's a "Klingon monster dog", but it also notes that, much like the guard dogs on Rura Penthe in Star Trek 6, they could be diferent breeds of Targ, and Worf's was just the least dangerous breed.